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• The variation of dopants (Cu/Mn) has been studied on Cd 0.4 Zn 0.6 O (0 ≤ x ≤ 1) prepared by chemical rout. • Mechanism of structural defects, faults, strain, dislocations are elaborated in-depth. • A redshift has been pronounced in doped samples owing to bandgap shrinkage. • Band-edge emission is found at 382, 417 nm, and Cu/Mn emission at 520/580 nm. • Resistivity, mobility, and carriers are altered due to change in ideal stoichiometry. Pure and Cu/Mn-doped Cd 0.4 Zn 0.6 O (0 ≤ x ≤ 1) ternary alloy is prepared by co-precipitation and further the variation of dopant concentration has been studied. The diffractogram of the undoped sample has peaks of both rocksalt (RS) CdO and wurtzite (WZ) ZnO phase. The individual and simultaneous doping of Cu and Mn elements has significantly altered the intensity, FWHM, and developments of defect states in Cd 0.4 Zn 0.6 O alloy. TEM microscope has investigated the crystalline size and interplanar spacing that is slightly decreased with dopant concentration which lies within the range ~ 38–30 nm. UV–Vis spectroscopy analyzed a decreasing trend in bandgap energy with dopant concentration. IN PL, the near band edge and deep trap state emission is observed at 382, 417, 448, 520 and 580 nm wavelengths. The resistivity, carrier concentration, and mobility are also computed which proposed that Cu/Mn-doped Cd 0.4 Zn 0.6 O alloy could be the better TCO with new opportunities for material science researchers. [ABSTRACT FROM AUTHOR]

• Cd 1-x Zn x O (0 ≤ x ≤ 1) nanopowder is formed by noble co-precipitate technique. • Structural analysis emphasized the modification of cubic CdO due to hexagonal ZnO. • Uv–vis spectra revealed red shift and E g is calculated in the range 2.5 ≤ E g ≤ 3.5 eV. • PL results showed emission peaks positioned at 387, 422, 448, 486, and 520 nm. • Cd 0.2 Zn 0.8 O has highest photocatalytic efficiency for decomposition of Methyl blue. We have synthesized Cd 1-x Zn x O (0 ≤ x ≤ 1) nanopowder by co-precipitation method for its comprehensive study. The Crystalline phase is changed from rocksalt CdO to wurtzite ZnO with an increase in 'x'. The existence of H 2 O, COO–, CdO, and ZnO group are confirmed by FTIR. SEM analysis investigated the spherical structure for x = 0.0 & 0.2 and flakes morphology for x = 0.4 & 0.6 and hexagonal block structure for x = 0.8 & 1.0. UV–Vis spectroscopy insured the increasing trend in bandgap energy within the range 2.5 ≤ E g ≤ 3.5 eV. PL results revealed a blue shift in excitonic and band edge emission. Methyl blue dye is being selected for decomposition using different samples of Cd 1-x Zn x O (0 ≤ x ≤ 1) nanopowder. It is found that sample with x = 0.8 has the highest catalytic efficiency under UV light. Moreover, higher efficiency of the ternary system is managed by its highly crystalline structure, less microstrain, large surface/volume ratio, and optical bandgap. [ABSTRACT FROM AUTHOR]